JPS6346890Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head used in a magnetic disk storage device.

Magnetic disk drives used as external storage devices for computers are becoming increasingly large in storage capacity, and along with the miniaturization of devices, there is an increasing demand for higher recording densities. Efforts have been made to increase the bit density and track density of magnetic disks. In order to increase the latter track density, a magnetic head is used in which erasing cores are placed on both sides of the front of the writing/reading core, and these are integrated into a button-shaped case or holder. There is. In this case, the magnetic gap position of the erasing core is shifted to the downstream side in the running direction of the magnetic medium (magnetic disk) with respect to the gap position of the writing/reading core, and the erasing core is used for the writing/reading. The circumferential edges of the tracks on the disk surface formed by the core are arranged. As such magnetic heads, there are conventionally known types called tunnel erase type or straddle type, depending on the configuration of the erasing core. FIG. 1 is a partially exploded front sectional view of the front part (the side facing the magnetic disk) of a conventional straddle type magnetic head, and FIG. FIG. The running direction of the magnetic disk is the direction shown by the arrow in FIG. 2, and therefore, FIG.
It is a sectional view along a line. A circular hole 10a is drilled in the front of the button-shaped case 10 at the front of the head, a circular non-magnetic slider 1 is embedded in this hole 10a, and an elongated through hole 2 extending in the disk running direction is bored in this slider. It is being A writing/reading core 3 is exposed from this through hole 2 to the front surface of the head. A pair of erasing cores 4 and 5, whose widths become narrower toward the front, as shown in FIG. Only the through hole 2 of the non-magnetic slider 1
It is exposed from the front to the front of the head (Figure 2). The exposed portions of the erasing cores 4 and 5 are located downstream of the magnetic gap 6 of the write/read core in the disk running direction, and are located between each of the erase cores 4, 5 and the central write/read core 3. A magnetic gap for erasing is formed in the area.

In this conventional straddle type magnetic head, a slider 1 with a through hole 2 is installed in the front part of the case in advance, and an erasing core and a writing/reading core are installed into the through hole of the slider. The assembly is extremely difficult and requires a lot of effort, and there is a step misalignment between the core and the slider, and there is also a gap between the core and the through hole of the slider 1 or a space on the back surface of the slider 1. In some cases, air bubbles were formed in the welded glass that was filled into the glass.

This invention eliminates such conventional problems and
To provide a magnetic head which can securely enclose welded glass and is easy to manufacture by assembling a combination of an erasing core and a slider block in the form of a sanderch in advance into a case.

For this purpose, the magnetic head according to the present invention forms an erasing core assembly by sandwiching a core with a non-magnetic block fixed to the outer part of the front part between non-magnetic slider blocks from both sides in the running direction of the magnetic medium. However, this erasing core assembly is arranged on both sides of the front part of the writing/reading core.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 3 is a perspective view of the erasing core assembly 11 according to the present invention. The illustrated erasing core assemblies 11 are arranged on both sides of the write/read core, as will be described later. The side of the erasing core 12 facing the side of the write/read core is defined as an inner portion 12a, and the opposite side thereof is defined as an outer portion 12b.
The erasing core 12 has a notched corner of its front outer portion 12b, and a block 13 made of a non-magnetic material such as barium titanate is fixed to this portion. The inner portion 12a of the front portion has a narrow wall thickness in the lateral direction (in the direction perpendicular to the running direction of the magnetic medium) so as to provide sufficient magnetic flux concentration. Slider blocks 14 and 14' made of non-magnetic material are fixed to the front part of the erasing core 12 and to both sides in the vertical direction, that is, to the upstream side and the downstream side in the direction of magnetic medium running as indicated by arrow A. The erasing core assembly is constructed by: FIG. 4 is a perspective view showing an example of the write/read core 3. FIG. The core 3 is formed by being divided into two parts, which are joined at the front with a welded glass or the like in between, and a magnetic gap 6 for writing and reading is formed between them. Note that the core 3
The sides of the magnetic medium in the running direction are reinforced with non-magnetic reinforcing members 15 and 16, if necessary. As shown in FIGS. 5 and 6, a non-magnetic material 17 such as titanium foil, beryllium foil, or glass film is interposed on both sides 3a of the write/read core 3 in the lateral direction to form an erase core assembly 11. is placed. In this case, as shown in FIG. 6, the core of the erasing core assembly 11 is assembled so that it is located slightly downstream of the position of the write/read magnetic gap 6 in the magnetic medium traveling direction. Erasing core 1 with the non-magnetic material 17 interposed therebetween
Erasing magnetic gaps 18 and 19 are located between the writing/reading core 3 and the writing/reading core 3. A rear core and a coil (both not shown) are attached to the rear of the erasing core 12 and the writing/reading core 3, and these cores constitute a magnetic circuit section of the magnetic head.

Figure 7 shows button-shaped case 2 applied to the present invention.
0 is a diagram of an example of 0 viewed from the front. Case 2
A window 21 is formed on the front surface of the magnetic circuit 0 to fit the outer shape of the front part of the magnetic circuit section in which the erasing core assembly 11 and the write/read core 3 are assembled. When the magnetic circuit section is assembled into the case, its front surface is exposed through the window 21 of the case 20, and the front surfaces thereof are polished after assembly so that they are on the same smooth surface.

As explained with reference to Figures 1 and 2, in a conventional magnetic head, a slider is inserted into a round hole on the front of the case, and an erasing core and a writing/reading core are exposed through a narrow through hole in the center of the slider. Since the structure is such that the eraser core and the slider block are assembled together in advance, the core may be misaligned or air bubbles may occur in the glass encapsulation, which may impair the magnetic properties. This assembly is arranged and fixed on both sides of the write/read core, and then housed in the case, making it an assembly block type structure.Therefore, there is no step shift as in the conventional case, and there is no problem with welded glass, etc. filling becomes reliable and manufacturing becomes extremely easy. In addition, in this invention, the front part of the erasing core is narrow, so it is possible to write and read with high sensitivity in a minute time and with a minute current, and it is possible to increase the flying height and rotate at high speed. Therefore, it is possible to further reduce the size of the device.

[Brief explanation of drawings]

Figure 1 is a partially exploded front sectional view of the front part of a conventional magnetic head, Figure 2 is a front view of the magnetic head shown in Figure 1, and Figure 3 is a front view of the main head. FIG. 4 is a perspective view of an erasing core assembly applied to the magnetic head of the invention, FIG. 4 is a perspective view of a write/read core applied to the invention, and FIG. A front cross-sectional view showing the front part partially exploded, FIG. 6 is a front view of the magnetic circuit section of the magnetic head according to the present invention, and FIG. 7 is a front view of the case applied to the present invention. It is a diagram. 3... Core for writing/reading, 6... Magnetic gap for writing/reading, 11... Core assembly for erasing, 12...
Erasing core, 13...Nonmagnetic block, 14,1
4'...Nonmagnetic slider block, 17...Nonmagnetic material, 18, 19...Magnetic gap for erasing, 20
...Case, 21...Window.

Claims (1)

[Scope of utility model registration request] The outer portion of the magnetic medium contacting surface of the erasing core piece is removed, and this removed portion is flush with the magnetic medium contacting surface of the inner remaining portion of the erasing core piece as a reference. Further, the erasing core piece and the non-magnetic block are fixed so as to be flush with the surface in contact with the magnetic medium from the upstream and downstream sides of the magnetic medium running direction. Sandwich-shaped erasing core assemblies are formed by sandwiching them between non-magnetic slider blocks, and the edges of the write/read cores on the upstream and downstream sides in the magnetic medium running direction are flush with the surface in contact with the magnetic medium. A non-magnetic reinforcing material is attached so that A two-way sandwich-arch magnetic head core structure is formed by sandwiching the sand-gerch-shaped erasing core assembly, and a magnetic head core structure having a shape substantially matching the outer shape of the magnetic medium contacting surface of the two-directional sandwich-arch magnetic head core structure is attached to the bottom of the case. 1. A magnetic head characterized in that a window hole is formed, and the two-way sandwich-arch magnetic head core assembly is inserted and fixed into the window hole so as to be flush with the outer surface of the case.